Shoe sewing machine



Aug. 31, 1943. o. R. HAAS SHO-E SEWING MACHINE Filed Oct. 18, 1941 2Sheets-Sheet l Aug. 31, 1943. r R H S 2,328,070

SHOE SEWING MACHINE Filed Oct. 18, 1941 2 Sheets-Sheet 2 Wit/06.53 I Ifivanfon v 3 Patented Angel, 1943 2,328,070 snoEsEwrNG MACHINE Otto R.Haas, North Beverly, Mass., assignor to United Shoe MachineryCorporation, Flemington, N. J., a corporation of New Jersey pplicationOctober is, 1941, SerialNo. 415,571

' SCIaiins. c1. 112-61) a The present invention relates to shoe outsolesewing machines, and more particularly to improvementshin mechanisms foractuating the presserfoot of an outsole stitcherof the type disclosed inU: S. Letters; Patent to French and Meyer No. 473,870 of April 26, 1892,and in pres ent inventors application for patent Serial 'No. 294,926,filed September 14, 1939. 1

For actuating the presser foot in the machine of thepatentandapplication above identified, the presser foot is secured to a leverhaving a ratchet on one-arm arranged to be engaged by apawlforlockingthe presser foot against the work: I Forclamping the *workbefore'a stitch is inserted'duringeach sewing cycle, a second relativelymovable arm having a ratchetisvyiel'd ingly connected with the presserfoot lever and arranged to be engagedby a clamping pawl which is movedbodilywhile engaging: the clamping ratchet. Before each feeding movementof the work, thepresser foot is unlocked and the: clamp ing pressurere1ieved,.both'pawls being held dis engagedii'rom theirrespectiveratchets during feed of the worktoupermit the presser foot. toaccommodate itself with the thickness of the actuating the pawls towardsandfrom engage ment with their respective ratchets and forsmoving a theclamping pawl bodily, there is" provided a single cam actuated lever onwhich theclamping pawl is mounted, aflxed pivot onthe machine frame forthelocking pawl, and a fixedstud work at the end of the feedingoperation. For

ments. Furthermore, the location-of pfiwls and, the cam lever in themachine renders'them inaccessible for making accurate adjustmentsaccording to the usual expedientsafter the machinehas been assembledcompletely, due to: lack of space andobstructionby other operating-partsof the machine. v

The object of the present invention is t0 .im,

prove the construction and simplify the manner of assembly and:adjustment either when the machine is being manufactured or at anytimethereafter when changes in adjustment or tim ing-are desired. Inaccordance? with thisaob-j ject, theprincipal featurerelates to the useof a a cam lever having 'adjustablemeansfor changing the times-ineachsewing cycle in whicha presserrfoot lockingi'spawl and -a presserfoo-t clamping pawliare actuated relatively to each other to lockthe'presserfoct and to caus'ethe presser foot'to clamp "the work in a"shoe sewing machine of the typewreferredto:having avfixed pivot for thelocking pawl and; a fixedstud against which the clampingpawl is "engagedto cause the pawls to bereleas'ed from their respec tiveiratchets atthe: proper time's; This feature a of the invention also includesprovision of'means for" changing the limitsof movementlimparted,

to-the clamping pawl by the cam 'leverwwithout changingzthe adjustmentofrelative timingvbew onthe frame against which the clamping pawl isengaged duringmovement of the cam lever to release the clampingpawlfront its ratchet,

thejparts being so located thatduring downward movement of the camlever, the lever will actuate the locking ,pawl away from itsratchet atdue as manufacturing inaccuracies or torequirementsmet .withspecialtypes of work, the actuation of the pawls towards: and from their ratchets to cause thework to be clamped with a suitable pressure and releasedfor feed does notoccur simultaneously orsuflicient movementis notimparted to one or both the ,pawls to accomplish the purposes intended,Numerous expedients have been adopted during manufacture of the machine,such as filing or bending the parts: in order to avoid these dimculties,but, where some change isnecess ary after the machine has beenassembled, most expedients have been found to v haveundesirable results,such as increasing weake nessin the parts or insuffici'ent rangeof,adjust+ substantially the same time theclamping pawl is released-fromits ratchet. In certain instances,

tween the pawls. In one form of the invention,

the cam lever has connected. withit-anarmon which :the clamping pawl "is,adjustably mounted and a locking pawl releasing arm. pivotallymountedconcentrically to the pivotal mounting of the clamping pawllever,the locking pawl vreleasing-arm being adjustablv secured tothe clamingpawl arm. In the preferred form; of they invention, the'fulcrum cfthecam lever is ad justableto change the positions; of:the clamping pawland releasing pawl arm simultaneously.

These and other features .of the invention, to-

gether with the construction, arrangements and combinations. of partshereinafter described and claimed, and the advantagesto be obtainedthereby, will readilybe understood by those skilled in the, art from thefollowing description, taken in connectionwith the accompanyingdrawings, in which Fig.1 is ,a sectionalyiew of a portion of an outsoleshoe sewing machine embodying the invention, parts having been broken\away and removed to illustrate more fully the construction; Fig,2-.is:a,view;on-an enlarged scalecf a cam actuated lever, pawls andratchets for the presser foot mechanism of the machinefillustre infi Fa. P v ew q th a downwardly.

actuated lever and clamping pawl supporting arm of Fig. 2; Fig. 4 is aside view of a cam actuated lever and pawl supporting arm in the Ipreferred formof the present invention; and

Fig. 5 is a sectional plan view of the cam lever and clamping pawlsupporting arm of Fig. 45.

The illustrated machine is an outsole stitcher of the same generalconstruction and mode of operation, except as hereinafter described, asthat disclosed in the patent and application above refe'rredto, and isprovided with a curved hook needle, a curved awl 2, and other stitchforming devices more fully disclosed in the patent and application. Tohold the work in position against the thrust of the awl duringsewingoperations of the machine, the machine is provided with a work support 4and a presser foot 6 actuated by which the machine originally wasadjusted to I operate is changed. To make these adjustments,

suitably shaped cams on a sewing *shaft 8 in timed relation with thestitch forming devices to clamp and release the work.

As in the machine of the patent and application, there is fulcrumed on astud l0 secured in the main frame, indicated at 12, at the rear of themachine, a cam actuated lever l4 having a roll I 5 engaging a cam on thesewing shaft.lPivotally mounted at the forward 'endof the lever I4 is apresser foot clamping pawl |6, arranged to engage a ratchet I8 securedto the free end of a clamping arm loosely'supported ona shaft 22 in theforward portion of the machine frame. After engagement with the ratchetl8, the'pawl moves bodily with the leve'r' M to clamp th work. Alsolooseon the shaft 22 is mounted a presser is moved downwardly by its cam, aprojecting portion of the lever engages an arm on the pawl 28. andcauses the pawl 28 to'be disengaged from the ratchet 26. At the sametime, a stud as at 34, fixed in'the frame I2, is engaged by a'shoulderon; the pawl l6, causing the'pawl IE to be disengaged from'the ratchet[8. 'To hold the resser foot with a light yielding pressure against thesurface of the work when the pawls are released,

atwhich time the feed takes place,- the rearward end of the presser footlever 24is'pr'essed upwardly by a light spring 35- acting on a link 36connected to the lever 24.- As thelever I4 is moved upwardly,aspiring-pressed plunger 31 engaging a second shoulder on the pawl l6,causes it to be re-engaged with the ratchet l8. the 1 same time, thelever l4 allows the locking-pawl 2 8 to re-engage the ratchet 2 61;" v

After the clamping p'awllG engages the ratchet l8, further upwardmovement of the lever l4 exerts a" yielding force through a spring 38coiled about a link 40 slidable in a lug on the clamping arm 20 andpivotally'connected to the rearward end of the presser foot lever24,'caus'ing acl'amp ing pressure of the presser foo t'to be exertedagainst the work on the work support. The pressure thus exerted on thework by the-presser foot is thereafter maintained throughout asubstantial portion of each sewing cycle by the looking ratchet andpawl, and-is released only after the presser foot actuating lever ismoved again In the machine of the; patent and application,

from the ratchet l8 in each sewing cycle.

sure toflbe exerted on the work. Later disen-' the machine iseitherpartially dismantled and the parts filed or an attempt is made to bendthe parts or to make suitable adjustments otherwise without removing theparts from the machine. adjustment of the presser foot actuatingmechanism without removing the parts from the machine is by bendingtheistud 34 in the proper direction to cause the clamping pawl it todisengage its ratchet l8 earlier .or later than the movement of thelever l4 with respect to actua- Bending thestud tion of the locking paw1,28. 3 necessitates further adjustments in the time of operation of thelocking pawl,; and these changes in turn require further changes in therange of movement imparted by the cam to the lever I4, Frequent bendingof the stud 34 results in breakage so that in any case it is. necessaryto dismantle the machine eventually for'replacement of the stud 34. Tofacilitate adjustments, a stud similar to that indicated at 42 on whichthe cam, roll I5 is mounted is? sometimes made with an eccentricportion, so that the position of the roll may be changed on; the leverbutwith this eccentric portion, the stud is rela-. tively inaccessiblein, the machine, it being reached for adjusting purposes only by,dismantling the machine, at least partially.

In order to avoid difliculties in adjusting the presser foot actuatingmechanism both during factory assembly. and also during operation whendifierent qualities and thicknesses of work are to be sewed, the lever Mof the present machine has a separate clamping pawl supporting arm44pivotally mounted on a bolt 46 secured in. the actuating lever l4.Thearm has a rearward extension through which passes a clamp bolt 38engaging a slot in the actuating-lever I4 and is forked at its forwardend to receive the clamping pawl l6 onahorizontal,pivotm). By. looseningthe clampbolt 48, theposition of the arm 44 may be changed with respectto the lever l4, thu's causinglcontact of the, clamping pawl 16 with thestud 34 to disengage. the pawl sooner or later Early disengagement ofthe clamping pawl causes late engagement and relativelylight clampingpresgag'ement' results in earlier engagement and relatively heavypressure 'on the work.

To enable a corresponding adjustment to'be made in the locking pawl sothat it will be operated'to' release the work as soon as theclampingpawl is disengaged/the. projection for releasing the lockingpawl 28 is formed on a second arm 52; The locking pawl releasing arm 52is also pivotally mounted on the bolt 46 and has a rearward extensioninto which. is threaded a clamp bolt 54 passing through a slot formed;in

I the rearward end of the clamping pawl support- A common expedient forchanging the cam lever 56.

, operation of the machine.

"claimed is:

9 2,328,070 the distance between the forward end of the clamping pawlreleasing arm 52 and the clamp-.

ing pawl supporting .arm:44 may be set suitably to correspond to-rtherelative distance between the fixed stud 34 and the fixed pivot 30 onwhich the locking pawl is mounted. .With the arm M so setand the bolt 54tightened, the pawls are actuated simultaneously towards and from theirratchets. If any adjustment is desired thereafter to enable the machineto operatesuccessfully on heavier or lighter work or to causethe presserfoot to exerta greater or less clamping force on' the work, the clampbolt- 48 for the clamping x pawl releasing arm 44 maybe loosenedto admitchange in 1 theposition ofthe arm on the lever l4. With changes inposition of the arm 44, no

, change occurs between thelocking pawl releasing arm and the arm whichis clamped thereto, so'that changes for variations in work thicknessesmay be made independently of changes in relative times at which thelocking and clamping pawls areieleased from their respective ratchets.

In a preferred form of the invention,eccentric adjusting devices for theclamping and. locking pawls are provided, as illustrated in Figs. 4 and5, The cam lever of this form of the invention is indicated at 5B,fulcrumed onthe stud l0 and arranged at its forward end to support theclamping pawl l6 instead of employing a separate arm, and thespring-pressedplunger 31 is mounted in the lever as in the patentandapplication. To provide means for adjusting the relative times ofoperation for the clamping pawl I6 and the locking pawl 28, aslot-endedarm,

58 is rotatably supported by the lever56 at its slotted end on a boltand is formed at its other end with a" lateral locking pawl releasingprojection 62 underlying the forward end. of the To hold the arm 58 inadjusted position, that end of the arm near the projection 62 isperforated to receive an eccentricsleeve 64 having a hexagonal collar.To support" the sleeve, a bolt 66 is threaded into an opening in the lever 56, the bolts 60 and 66; when tightened, securing the arm 58 rigidlywith the lever 56.

To regulate the limits of movement imparted l by the cam lever to theclamping and locking pawls, the stud ID is surrounded by an eccentricflanged s1eeve68 clamped withinthe split hub :of thercam lever 56 by a,drawbolt I0. spanner holes 12 are provided in the flange of Suitablepresserfoot and mechanism for actuating the presser foot toclamp andrelease the'work com-.-

prising "a lever having a locking ratchet, a looking pawlfor engagingthe ratchet; a clamping arm having a ratchet connected to the presserfoot, a clamping pawl forengaging the ratchet upon the clamping arm, afixed pivot for the locking pawl, a. fixed stud against which theclamping pawl is engaged to release said clamping pawl from its ratchet,a cam lever for caus-' ing both pawls to be actuated towards andfromtheir respective ratchets and for'moving the clamping pawl bodily toforce the presser foot against the work, and adjustable means connectedto said lever for changing the times in each sewing cycle at which thepawls are actu: ated relatively to each other.

2. A shoe sewing machine having, in combination, stitch forming devices,a work support, a

presserfoot and mechanism for actuatingthe presser foot to clamp andrelease the'work comprising a lever having a locking ratchet, a lockingpawl for engaging the ratchet, a clamping the sleeve to enable thesleeve to be rotated easily. The eccentric adjusting devices enable theoperator to regulate the. presser foot operating mechanism moresatisfactorily in certain respects than in the previously describedembodiment of the invention, particularly where adjustments are madewith work in the machine or with the springs for actuating the presserfoot invention, what is l. A shoe sewing machine having, incombinatio-n,istitch forming devices, a work support, a

arm having a ratchet connected to the presser foot, a clamping pawl forengaging theratchet upon the clamping arm, a fixed pivot for the lockingpawl, a fixed stud against which "the clamping: pawl is engagedtorelease said clamp-' ing pawl from its ratchet, a cam lever for causingboth pawls to be actuated towards and from their "respective ratchetsand-for moving the clamping pawl bodily to force the presser footagainst the work, and adjustable means connected to said lever forchanging the times in each sewing" cycle at which the pawls are actuatedrelativelyio each other and for changing the limits of movement impartedto the clamping pawl by the earn lever without changing the adjustmentof relative timing between the pawls. 3. Ashoe sewing machine having, incombi nation, stitch forming devices, a Work support, a presser foot andmechanism for "actuatingtlie presser'foot to clamp and release the workcom-y prising a lever having a locking ratchet",a looking pawl forengaging-the ratchet, a clamping arm having a ratchet connected to thepresser foot, a clamping pawl for 'engagingthe ratchet upon the clampingarm, a fixed pivot for the locki paw a fixed stud against which theclamping pawl is engaged to release said clamping;pawl from its ratchet,a cam lever for causing both pawls to be actuated towards and from theirrespective ratchets and for moving the clamping pawl bodily to force,the presser foot against the work, and an arm on which the clamping pawlis mounted adjustably connected to the cam lever to change the time ineach sewing cycle at which the pawls are actuated relatively to eachother.

4. A shoe sewing machine having, in combination, stitch forming devices,a work support,

a presser foot and mechanism for actuating the presser foot to clamp andrelease the work comprising a lever having a locking ratchet, a lockingpawl for engaging the ratchet, a clamping arm having a ratchet connectedto thejpresser foot, a clamping pawl for engaging the ratchet upon theclamping arm, a fixed pivot for the locking pawl, a fixed stud againstwhich the clamping pawl is engaged to release said clamping pawl fromits ratchet, a cam lever for causing both pawls to be actuated towardsand from their respective ratchets and ,for moving the clamping pawlbodily to force'thepresser foot against the work, an arm on which theclamping pawl is mounted adjustably connected to the cam lever to changethe time in each sewing cycleat which the pawls are actuated relativelytoeach other, and a locking pawl releasing arm adjustably secureclto thearm on which the clamping pawl ismounted to enable the limits ofmovement imparted to the clamping pawl by the arm having a ratchetconnected to the presser foot, a clamping pawl for engaging the ratchetupon the clamping arm, a fixed pivot for the locking pawl, a fixed studagainst which the clamping pawl is engaged to releasesaid clamping pawlfrom its ratchet, a camleverv for causing both pawls to be actuatedtowards andfrom their respective ratchets and for moving the clampingpawl bodily to force the presser foot against the'work, an arm on whichthe clamping pawl is mounted adjustably connected to the cam lever tochange the time in each sewing cycle at which the pawls are actuated, alocking pawl releasing arm pivotally mounted concentrically to thepivotal mounting of the clamping pawl arm, and means for adjustablysecuring the locking pawl releasing arm to the clamping pawl arm.

6. A shoe sewing machine'having, in combination, stitch forming devices,a work support, a presser foot and mechanism for actuating the presserfoot to clamp and release theworkcomprising a lever having a lockingratchet, a lock: ingpawl for engaging the ratchet, a clamping arm havinga ratchet connected to the presser foot, a clamping pawl for engagingthe ratchet upon the clamping arm, a fixed pivot for the locking pawl, afixed stud against which the clampingpawl is engaged to release saidclamping pawl from its ratchet, a cam lever for causing both pawls to beactuated towards and from their respective ratchets and for moving theclamping pawl bodily to force the presser foot against the work, andadjustable means including an eccentric operatively connecting the leverand one of the pawls to enable the times in each sewing cycle at whichthe pawls are actuated to be changed relatively to each other.

7. A shoe sewing machinehaving, in combination, stitch forming devices,a :work support, a presser foot and mechanism for actuating the presserfoot to clamp and release the work comprising a lever having a lockingratchet, a locking pawl for engaging the ratchet, a clamping arm havinga ratchet connected to the presser foot, a clamping pawl for engagingthe ratchet upon the clamping arm, a fixed pivot forthe locking pawl, afixed stud against which the clamping pawl is engaged to release saidclamping pawl from its ratchet, a cam lever for causing both pawls to beactuated towards and from their respective ratchets and for moving theclamping pawl bodily to force the presser foot against the work,andadjustable means including an arm arranged to cause the locking pawlto be disengaged from its ratchet and eccentric means operativelyconnecting the locking pawl releasing arm to the cam lever to enable thetimes in each sewing cycle at which the pawls are actuated relatively toeach other to be changed.

8; A shoe sewing machine having, in combination, stitch forming devices,a'work support, a presser footand mechanism for actuating the presserfoot to clamp and release thework comprising a lever having a lockingratchet, a looking pawl for engaging the ratchet, a clamping arm havinga ratchet connected to the presser foot, a clamping pawlfor engaging theratchet upon the clamping arm, a fixed pivot for the locking pawl, afixed stud against which the clamping pawl is engaged to release saidclamping pawl from its ratchet, a cam lever'for causing both pawls to beactuated towards and from their respective ratchets and for moving theclamping pawl bodily to force the presser foot against the work,adjustable meansincluding an arm arranged to cause the locking pawl tobe OTTO ,R. nA s.

